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Tue, 15 Dec 2020 03:32:05 +0000 From: Hoang Huu Le To: jmaloy@redhat.com, maloy@donjonn.com, ying.xue@windriver.com, netdev@vger.kernel.org Cc: Hoang Le Subject: [net-next] tipc: do sanity check payload of a netlink message Date: Tue, 15 Dec 2020 10:31:51 +0700 Message-Id: <20201215033151.76139-1-hoang.h.le@dektech.com.au> X-Mailer: git-send-email 2.25.1 X-Originating-IP: [14.161.14.188] X-ClientProxiedBy: SG2PR01CA0139.apcprd01.prod.exchangelabs.com (2603:1096:4:8f::19) To VI1PR05MB4605.eurprd05.prod.outlook.com (2603:10a6:802:61::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dektech.com.au (14.161.14.188) by SG2PR01CA0139.apcprd01.prod.exchangelabs.com (2603:1096:4:8f::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3654.12 via Frontend Transport; Tue, 15 Dec 2020 03:32:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 893587a4-2bb0-40e1-9fce-08d8a0a9fe78 X-MS-TrafficTypeDiagnostic: VI1PR05MB6720: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:849; 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We fix it by making the parsing call conditional. Acked-by: Jon Maloy Signed-off-by: Hoang Le --- net/tipc/netlink_compat.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c index 82f154989418..5a1ce64039f7 100644 --- a/net/tipc/netlink_compat.c +++ b/net/tipc/netlink_compat.c @@ -213,12 +213,14 @@ static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd, } info.attrs = attrbuf; - err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf, - tipc_genl_family.maxattr, - tipc_genl_family.policy, NULL); - if (err) - goto err_out; + if (nlmsg_len(cb.nlh) > 0) { + err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf, + tipc_genl_family.maxattr, + tipc_genl_family.policy, NULL); + if (err) + goto err_out; + } do { int rem;